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Two identical speakers are initially equal distances
from a listener . The
listener hears a sound maximum (constructive
interference). When the upper speaker is moved back
by a distance d = 2 m, the listener hears a sound
minimum (destructive interference). What is the
longest wavelength the soundwaves could have?

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(a) If the speaker is at its lowest frequency (f= 2,000 Hz) that produces destructive interference at the location of the microphone, what is the path length difference AL (in m) between the direct and the reflected sound waves that reach the microphone? to

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